Electron-phonon interactions in subband excited photoluminescence of hexagonal boron nitride
| Autor: | Ilya Weinstein, D. A. Zamyatin, Alexander Vokhmintsev |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Photoluminescence Scattering Phonon Biophysics 02 engineering and technology General Chemistry Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Molecular physics Atomic and Molecular Physics and Optics 0104 chemical sciences Brillouin zone symbols.namesake Excited state symbols Spontaneous emission 0210 nano-technology Raman spectroscopy Excitation |
| Zdroj: | Journal of Luminescence. 208:363-370 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2018.12.036 |
| Popis: | The h-BN microcrystalline powder with carbon and oxygen impurities have been studied at 83 and 296 K using Raman and photoluminescence (PL) spectroscopies. The observed blue shift of Raman peaks with temperature decreasing have been discussed. Two series of phonon replicas in PL emission spectra with a zero-phonon line at 4.08 eV have been registered under 4.28 eV excitation. The energy levels model of the impurity (CN-ON)-complex responsible for observe luminescence was proposed. It was shown that the optically active center retains its electroneutrality in the processes of radiative recombination under subband (in 4.28 eV) or band-to-band excitation. Possible mechanisms of electron-phonon scattering and phonon replicas forming under subband excitation of (CN-ON)-complex were analyzed. It was substantiated that at 83 K the longitudinal optical (ℏωLO = 174 meV) and transverse acoustic (ℏωTA = 60 meV) phonons at the middle points of high symmetry in the first Brillouin zone participate in the processes of intravalley (M- and Κ-scattering) and intervalley (Κ → Μ)-scattering, respectively. |
| Databáze: | OpenAIRE |
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